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ASTM International - ASTM D5464-93(2001)

Standard Test Methods for pH Measurement of Water of Low Conductivity

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Organization: ASTM International
Publication Date: 1 January 2001
Status: inactive
Page Count: 14
ICS Code (Examination of water for chemical substances): 13.060.50
scope:

1.1 These test methods are applicable to determine the pH of water samples with a conductivity lower than 100 µ S/cm (see Annex A1 and Table A1.1 and Table A1.2 ) over the pH range of 3 to 11 (see Fig. 1). pH measurements of water of low conductivity are problematical (see Annex A2). Specifically, these test methods avoid contamination of the sample with atmospheric gases (see Section 7) and prevent volatile components of the sample from escaping. These test methods provide for pH electrodes and apparatus that address the considerations discussed in Annex A2. These test methods also minimize problems associated with the sample's pH temperature coefficient when the operator uses these test methods to calibrate an on-line pH monitor or controller (see Appendix X1). Two test methods are given as follows:

Test Method

Sections

Test Method A-Precise pH Measurement of LowConductivity Water Utilizing the Real-TimeFlowing Sample Procedure5 to 12
Test Method B-pH Measurement of Low Conductivity Water Utilizing the Static Grab SampleProcedure13 to 20

1.2 Test Method A covers the precise measurement of pH in water of low conductivity utilizing a real-time, short duration, flowing sample procedure.

1.3 Test Method B covers the measurement of pH in water of low conductivity with a lower limit of 2.0 S/cm, utilizing a static grab-sample procedure where it is not practicable to take a real-time flowing sample.

Note 1--Test Method A is preferred over Test Method B whenever possible. Test Method A is not subject to the limited conductivity range, temperature interferences, potential KCl contamination, and time limitations found with Test Method B.

1.4 The values stated in SI units are to be regarded as standard.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Document History

June 1, 2016
Standard Test Method for pH Measurement of Water of Low Conductivity
6.1 pH measurement of low conductivity water is frequently applied to power plant water and condensed steam samples for corrosion and scale prevention. It is sometimes used in pure water treatment...
May 1, 2011
Standard Test Method for pH Measurement of Water of Low Conductivity
1.1 This test method is applicable to determine the pH of water samples with a conductivity of 2 to 100 μS/cm over the pH range of 3 to 11. pH measurements of water of low conductivity are...
August 1, 2007
Standard Test Method for pH Measurement of Water of Low Conductivity
pH measurement of low conductivity water is frequently applied to power plant water and condensed steam samples for corrosion and scale prevention. It is sometimes used in pure water treatment...
ASTM D5464-93(2001)
January 1, 2001
Standard Test Methods for pH Measurement of Water of Low Conductivity
1.1 These test methods are applicable to determine the pH of water samples with a conductivity lower than 100 µ S/cm (see Annex A1 and Table A1.1 and Table A1.2 ) over the pH range of 3 to 11 (see...
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